Controlled π-junctions in a T-shaped double quantum dot system

被引：5
|
作者：
Pan, H. [1 ]
Zhao, Y. -H. [2 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Dept Phys, Beijing 100083, Peoples R China
[2] Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA
来源：
EUROPEAN PHYSICAL JOURNAL B | 2009年 / 70卷 / 02期
基金：
中国国家自然科学基金;
关键词：
IMPURITY JOSEPHSON-JUNCTION; FLUX QUBIT; SUPERCURRENT; TRANSPORT; SUPERCONDUCTORS; FERROMAGNET; DYNAMICS;
D O I：
10.1140/epjb/e2009-00195-2
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The pi-junction transition of a T-shaped double quantum dot system is investigated theoretically by using the nonequilibrium Green's function method. It is found that the pi-junction transition can occur with increasing the spin-flip strength. Furthermore, the pi-junction in the system can be controlled by tuning the system parameters, such as the two quantum dot energy levels and the interdot coupling. These controlled pi-junction transitions are interpreted in the picture of current-carrying density of states. When the main contributions to supercurrent is changed between the positive discrete spectrum and the negative continuous spectrum, the pi-junction transitions can happen.
引用
收藏
页码：185 / 191
页数：7
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